dial tone
dial tone 英 [ˈdaiəl təun] 美 [ˈdaɪəl toʊn]
phrase. 拨号音；拨号音调
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- phrase. 拨号音；拨号音调
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1. The phone must be out of order if you can’t hear a dial tone.
如果听不到拨号音，电话一定是坏了。
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2. I've been looking around for a "commercially supported cloud-based VOIP PBX that provides dial tone" for the past few weeks and I keep coming up empty on the SIP phones.
在过去的几周里，我四处在寻觅着一个“商业支撑下、基于云的并可提供拨号音的网络电话交换机”，而一直无法享用SIP电话。
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3. Like many other developers with a history in telecom, I learned that when you build a telephone switch, regulations say it must provide dial tone in 40ms, a difficult requirement to achieve.
像许多常年混迹于电信行业中的开发人员一样，我所学习到的是，若实现一个电话交换，则一定要在40毫秒内发出拨号音，这是一个难以实现的需求。
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